US Patent No. 5,851,546A/USA dt. 22/12/1998
A process for the preparation of polymer composition for controlled release of active ingredients in response to pH. RA Mashelkar, MG Kulkarni, RN Karmalkar
US Patent No. 5,851,546A/USA dt. 22/12/1998
A process for the preparation of polymer composition for controlled release of active ingredients in response to pH. RA Mashelkar, MG Kulkarni, RN Karmalkar